<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hello Vue</title>
    <script src="js/vue.js"></script>
</head>

<body>
    <div id="root">
        {{text}}
    </div>
</body>
<script>
    let data = {
        text: "hahah"
    }
    const vm = new Vue({
        el: "#root",
        data
    })

    console.log(vm._data === data);
    console.log(vm.$data === data);
</script>

</html>